Back for rotary scrubbing brushes



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Dec. 27, 1927. 1,654,036

I. C. CARPENTER BACK FOR ROTARY SICRUBBING BRUSHES Filed Sept. 25. 1926Patented Dec. 27, 1927.

IRA C. CARPENTER, F CLEVELAND, OHIO.

BACK FOR ROTARY SCRUBBING BRUSHES. Y

Application filed September 25, 1926. Serial No. 137,722..

This invention relates to improvements in hacks for rotary brushessuitable for use in apparatus employed in scrubbing or cleaning floorsand floor-coverings such, for instance, as rugs and carpets, and theherinafter described brush-back is arranged substantially horizontallyand adapted to be operatively connected, at its central portion, with anupright shaft for'rotating said back.

One object of this invention is to produce a brush-back of the characterindicated comprising simple and reliable improved means for attachingthe brusl1back to said shaft. Another object is to produce a l5brush-back of the character indicated which has an annular chambersurrounding and spaced from and arrangedsubstantially concentric inrelation to the axis of the back and having abottom which has severalsubstan- ZU tially annularly arranged and horizontally spaced series ofholes adapted to be engaged by bristles or brushing elements. adapted toextend downwardly from the back and .also' has slots formed between saidseries of holes and spaced circumferentially of the axis of the back andarranged to permit the passage of a cleansing liquid downwardly throughsaid bottom.

Another object is to have the hereinbefore 32 mentioned annular chamberopen at its upper end all round the axis of the brushback so as topermit the extension, into said chamber, of means for delivering acleansing liquid within said chamber during the rotaas tion of thebrush-back with the hereinbefore mentioned shaft.

.Another object is to "secure an adequate l and substantially uniformdistribution of the I cleansing liquidto the bristles.or brushingelements during the rotation of a brush comprising the hereinafterdescribed back.

Another object is to render my improved brush-back durable inconstruction, and to facilitate the assemblage of the component parts ofthe back.

With these objects in view, and to attain other objects hereinafterappearing, this invention consists in certain meritorious structuralfeatures of said. brush-back and combinations and relative arrangementsof parts, hereinafter described in this specification, pointed out inthe claims, and illustrated in the accompanying drawings.

In said drawings, Figure 1 is a top plan 5 of said brush-back and showssaid back as secured to the vhereinbefore mentioned the inner flange 7of said. plate,

shaft which is shown in section. Fig. 2 is a central vertical sectiontaken along the dashed line 2-2 in Fig. 1, except that in F g. 2 thebrush-back is shown provided with tufts of bristles or brushing elementsnot shown in Fig. 1.

The substantially horizontally arranged brush-back illustrated in saiddrawings is adapted to extend, at its central portion, under andattachable to and rotatable with a substantially vertical shaft 4:adapted to be employed in rotating the rotary scrubbing brush comprisingsaid back, and said shaft is appl ed and driven in any approved manner.said back preferably comprises a substantially horiaontally arrangedcircular metal plate 5 provlded, preferably at its circumference, w1than upwardly projecting outer annular flange 6-which is concentric inrelation to the axis of the back. The plate 5 has an upwardly projectinginner annular flange 7 which is adequately spaced from the outer flange6 and substantially concentric in relatlonto said outer flange andtherefore substantially concentric in relation to the axis of thebrush-back. The plate 5. and its flanges 6 and'7 are preferably com osedof a single casting of aluminum. Sai flanges G and 7 constitute oppositeside walls respectively of a substantially horizontal annular chamber 8which is substantially concentric in relation to the axis of thebrush-back and open at its upper end.

The inner flange 7 constitutes the surrounding wall of a chamber 9formed at the central portion of the brush-back, and a circular metaltop plate 10 is seated on the upper end of said flange. The top plate 10has an upwardly enlarged central portion 12 and a screw-threaded hole 13formed centrally of and extending vertically through said plate. The topplate 10 is shown screwed at its hole 13 onto the externallyscrew-threaded lower end of the shaft 4.- and also shown fastened tosaid shaft by a removable pin 14 shown extending horizontally throughthe e' larged central ortion 12 of said plate and through the sha t.

The central portion of the plate 5 constitutes the bottom of the innerchamber 9, and said bottom preferably has a circular recess 15 formed atthe inner side of and centrally in relation to said bottom. Said recesshas a diameter which measures considerably less than the internaldiameter of and said lll "top plate in recess forms a downwardenlargement of said chamber. The bottom of said recess is imperforateand has a thickness which measuresconsiderably less than the thicknessof the plate 5 between said recess and the outer flange 6 so as toeconomize in the amount of metal required for casting the plate 5.

Means for removably securing the top plate 10 in place in relation tothe inner flange 7 of the plate 5 comprise substantially verticalstud-bolts 16 and nut 17. The bolts 16 are'arranged between said innerflange 7 and the recess 15 and threaded into the plate 5 externally ofsaid recess and spaced circumferentially of said recess. The bolts 16extend loosely through holes 18 formed in the top plate 10 and spacedcircumferentially of the enlarged portion 12 of said plate, and the nuts17 are screwed above the top plate 10 onto said bolts and are arrangedto cooperate with said bolts in securing said place on the inner flange7 of the plate 5. By the hereinbefore described construction andrelative arrangement of parts it will be observed that the centralportion including the inner flange 7 of the plate 5, the bolts 16, nuts17 and top plate 10 constitute simple, strong and reliable means. forattaching my improved brush-back to the shaft 4.

The plate 5 is provided, between its flanges 6 and 7, with severalhorizontally spaced and annularly arranged series of holes 20. Eachseries of ho cs 20 extends circumferentially of the axis of thebrushback, and the holes of said series of holes are spacedcircumferentially of the axis of the brush-back. Said holes 20 extend tothe outer side of the bottom of the annular chamber 8 and therefore to.the under side of and preferably vertically through the plate 5 and areadapted to be engaged by bristles or brushing elements not shown inFig. 1. Each series of holes 20 is substantial concentric in relation tothe axis of the rush-back, and two of the holes of each series of holes20 are illustrated in central h section in Fig. 2. Fig. 2 shows holes 20which are considerabl smaller diametrically attheir upper endg than attheir lower ends and also shows said holes as engaged by tufts ofbristles 21 applied and secured to the plate 5 in an approved manner andextending downwar ly from the late.

Between adjacent series of ho cs 20 the plate 5 has an annularlyarranged series of slots 22 which are spaced circumferentiall of theaxis of the brush-back, and each series of slots '22 extendscircumferentially of and is substantially concentric in relation to saidaxis. Each slot of each series of slots 22 extends a considerabledistance circumferentially of the axis of the brushback and from theinner side to the outer side of the bottom of the annular chamber 8 andtherefore from the upper side to the under' side and preferablyvertically through the plate 5 and constitutes a hi hl practical passagearranged to permit eel mg of a cleansing liquid to bristles or brushingelements applied adjacent said series of slots. To attain a desirableand substantially uniform distribution of cleansing liquld to thebristles or brushing elements of a rotary brush comprising thehereinbefore described back the slots of the outer of adjacent series ofslots 22 are in staggered relation to the slots of the inner of said\adjacent series of slots, and each slot of the outer of said adjacentseries of slots extends substantially equidistantly circumferentially ofadjacent portions of two adjacent slots of the inner of said adjacentseries of slots.

What I claim is 1. A brush-back of the character indicated adapted to beattached to and rotatable with an upright shaft and com rising asubstantially horizontally arrange plate having two upwardly projectingspaced annular flanges which are substantially concentric in relation tothe axis of the back, said plate "having between said flanges severalhorizontally spaced and annularly arranged series of holes which extendto the under side of the plate and are adapted to be engaged by bristlesor brushing elements, each of said series of holes being substantiallyconcentric in relation to the aforesaid axis, the plate having annularlyarranged series of slots between adjacent series ofbrushing-element-receiving holes, each series of slots beingsubstantially concentric in relation to the aforesaid axis, and theslots of each series of slots being spaced and extendingcircumferentially of said axis and also extending from the upper side tothe under side of the late.

2. A brush-birch of the character indicated adapted to be attached toand rotatable with anupright shaft and com rising a substantiallyhorizontally arranged plate aving two upwardly pro'ecting spaced annularflanges which are sul istant ally concentric in re ation to the axis ofthe back, said late havin between said flanges severa horizontall spacedand annularly arranged series of oles which extend to the under side ofthe plate and are adapted to be engaged by bristles or brushingelements, each of said series of holes being substantially concentric inrelation to the aforesaid axis, the plate having annularly arrangedseries of spaced slots between ad acent series ofbrushing-element-receiving holes, said slot being 5 aced and extendingcircumferentially o the aforesaid axis and also extendin from the upperside to the under side of t e plate, the slots of the outer of llUtially of adjacent portions of two adjacent 7 slots of the inner of saidadjacent series of slots. I

3. In a brush-back of the character indi cated, the combination, with asubstantially. horizontally arranged plate having two upwardlyprojecting spaced annular flanges which are substantially concentric inrelation to the axis of the back and provided between said flanges withholes which extend to the under side of the plate and are adapted to beengaged by bristles or brush ing elements, said plate also beingprovided between said flan es with slots extending fromthe upper side tothe under side of said plate, of a top plate seated and secured in placeon the inner flange of the aforesaid flanges and adapted to be securedto an up right shaft for rotating the brush-back.

4. In a brush-back of the character indicated, the combination; with asubstantially horizontally arranged platehaving two upwardly projecting.spaced annular flanges which are substantially concentric in relationto the axis of the back and provided, between said flanges, with holesfor receiv: ing bristles or brushing elements and with slots for thepassa e of cleansing liquid downwardly througfi said plate of a topplate seated on the inner flange oi the aforesa'id flanges and providedcentrally with a screw-threaded hole for threading it onto the lower endof an upright shaft for rotating the brush-back, upright bolts arrangedbetween said inner flange and the axis of said back and spacedcircumferentially of said axis, said bolts being rigid with thefirst-mentioned late and extending loosely through and a ove thesecond-mentionedplate, and nuts screwed onto said bolts above thesecond-mentioned plate and arranged to cooperate with said bolts inholding said second-mentioned plate in place on the aforesaid innerflange. v

In testimony whereof, I sign the foregoing specification. i

- IRA G. CARPENTER.

